chrome: Add out-of-line copy ctors for complex classes.

chrome/common/importer/importer_url_row.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_IMPORTER_IMPORTER_URL_ROW_H_
 #define CHROME_COMMON_IMPORTER_IMPORTER_URL_ROW_H_
 
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "url/gurl.h"
 
 // Used as the target for importing history URLs from other browser's profiles
 // in the utility process. Converted to history::URLRow after being passed via
 // IPC to the browser.
 struct ImporterURLRow {
  public:
   ImporterURLRow();
   explicit ImporterURLRow(const GURL& url);
+  ImporterURLRow(const ImporterURLRow& other);
 
   GURL url;
   base::string16 title;
 
   // Total number of times this URL has been visited.
   int visit_count;
 
   // Number of times this URL has been manually entered in the URL bar.
   int typed_count;
 
   // The date of the last visit of this URL, which saves us from having to
   // loop up in the visit table for things like autocomplete and expiration.
   base::Time last_visit;
 
   // Indicates this entry should now be shown in typical UI or queries, this
   // is usually for subframes.
   bool hidden;
 };
 
 #endif  // CHROME_COMMON_IMPORTER_IMPORTER_URL_ROW_H_